Age Calculator
Enter your date of birth and see your exact age — plus a countdown to your next birthday.
Defaults to today — change it to work out your age on any date.
- In total months—
- In total weeks—
- In total days—
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Pick your date of birth above to see your age.
How the age calculator works
Just two dates in — a full breakdown out. Nothing to install, nothing uploaded.
Enter your date of birth
Type or pick the day you were born. The result updates the moment you choose a date.
Pick an "age as of" date
Leave it on today for your current age, or set any past or future date to see your age then.
Read your results
Your exact age in years, months and days, the totals, and days until your next birthday.
How your age is calculated
Your age in years, months and days is worked out the way people naturally count it. We start from your date of birth and count whole years up to the "age as of" date, then the leftover whole months, then the remaining days. Because months have different lengths, the day count borrows from the correct number of days in the previous month — so the answer always lines up with the calendar.
The totals show the same span measured a single way: your entire age expressed only in months, only in weeks, or only in days. Days until your next birthday counts forward from the "age as of" date to the next time your birthday comes around (leap-day birthdays roll to the 1st of the following month in non-leap years).
Is my data private?
Yes. Everything runs right here in your browser. Your dates are never sent anywhere and nothing is stored — close the tab and it's gone.